Abstract
Propylene epoxidation and deep oxidation on porous silver electrodes was studied galvanostatically in the solid electrolyte cell , , , , , , . It was found that when O2− ions are pumped electrochemically to the silver catalyst electrode, the rates of propylene epoxidation and oxidation to increase significantly with simultaneous enhancement of the selectivity to propylene oxide. The opposite effect is observed upon reversal of the pumping voltage. The enhancement in the rate of epoxidation and deep oxidation can exceed the rate of O2− pumping by two orders of magnitude. The magnitude of the catalytic rate enhancement depends on the imposed current, anodic gas composition, and catalyst electrode surface area, and is proportional to the pumping voltage. This new phenomenon is similar to that observed with ethylene oxidation and appears to be due to formation of a catalytically active surface silver oxide at the anode.
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